/*
 * Copyright (c) 2002, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.tools.javac.code;

import static javax.lang.model.SourceVersion.RELEASE_2;
import static javax.lang.model.SourceVersion.RELEASE_3;
import static javax.lang.model.SourceVersion.RELEASE_4;
import static javax.lang.model.SourceVersion.RELEASE_5;
import static javax.lang.model.SourceVersion.RELEASE_6;

import java.util.HashMap;
import java.util.Map;

import javax.lang.model.SourceVersion;

import com.sun.tools.javac.jvm.Target;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Options;

/**
 * The source language version accepted.
 * 
 * <p>
 * <b>This is NOT part of any supported API. If you write code that depends on
 * this, you do so at your own risk. This code and its internal interfaces are
 * subject to change or deletion without notice.</b>
 */
public enum Source {
	/** 1.0 had no inner classes, and so could not pass the JCK. */
	// public static final Source JDK1_0 = new Source("1.0");

	/** 1.1 did not have strictfp, and so could not pass the JCK. */
	// public static final Source JDK1_1 = new Source("1.1");

	/** 1.2 introduced strictfp. */
	JDK1_2("1.2"),

	/** 1.3 is the same language as 1.2. */
	JDK1_3("1.3"),

	/** 1.4 introduced assert. */
	JDK1_4("1.4"),

	/**
	 * 1.5 introduced generics, attributes, foreach, boxing, static import,
	 * covariant return, enums, varargs, et al.
	 */
	JDK1_5("1.5"),

	/** 1.6 reports encoding problems as errors instead of warnings. */
	JDK1_6("1.6");

	private static final Context.Key<Source> sourceKey = new Context.Key<Source>();

	public static Source instance(Context context) {
		Source instance = context.get(sourceKey);
		if (instance == null) {
			Options options = Options.instance(context);
			String sourceString = options.get("-source");
			if (sourceString != null)
				instance = lookup(sourceString);
			if (instance == null)
				instance = DEFAULT;
			context.put(sourceKey, instance);
		}
		return instance;
	}

	public final String name;

	private static Map<String, Source> tab = new HashMap<String, Source>();
	static {
		for (Source s : values()) {
			tab.put(s.name, s);
		}
		tab.put("5", JDK1_5); // Make 5 an alias for 1.5
		tab.put("6", JDK1_6); // Make 6 an alias for 1.6
	}

	private Source(String name) {
		this.name = name;
	}

	public static final Source DEFAULT = JDK1_5;

	public static Source lookup(String name) {
		return tab.get(name);
	}

	public Target requiredTarget() {
		if (this.compareTo(JDK1_6) >= 0)
			return Target.JDK1_6;
		if (this.compareTo(JDK1_5) >= 0)
			return Target.JDK1_5;
		if (this.compareTo(JDK1_4) >= 0)
			return Target.JDK1_4;
		return Target.JDK1_1;
	}

	/** Allow encoding errors, giving only warnings. */
	public boolean allowEncodingErrors() {
		return compareTo(JDK1_6) < 0;
	}

	public boolean allowAsserts() {
		return compareTo(JDK1_4) >= 0;
	}

	public boolean allowCovariantReturns() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean allowGenerics() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean allowEnums() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean allowForeach() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean allowStaticImport() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean allowBoxing() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean allowVarargs() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean allowAnnotations() {
		return compareTo(JDK1_5) >= 0;
	}

	// hex floating-point literals supported?
	public boolean allowHexFloats() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean allowAnonOuterThis() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean addBridges() {
		return compareTo(JDK1_5) >= 0;
	}

	public boolean enforceMandatoryWarnings() {
		return compareTo(JDK1_5) >= 0;
	}

	public static SourceVersion toSourceVersion(Source source) {
		switch (source) {
		case JDK1_2:
			return RELEASE_2;
		case JDK1_3:
			return RELEASE_3;
		case JDK1_4:
			return RELEASE_4;
		case JDK1_5:
			return RELEASE_5;
		case JDK1_6:
			return RELEASE_6;
		default:
			return null;
		}
	}
}
